Business Combinations - Fair Value of the Assets Purchased, Including Goodwill and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Oct. 19, 2018
Assets:
Goodwill	$ 205,260	$ 204,753
First Green Bancorp, Inc. | Measurement Period Adjustments
Assets:
Cash			$ 0
Investment securities			0
Loans, net			0
Fixed assets			0
Other real estate owned			0
Core deposit intangibles			(678)
Goodwill			506
Other assets			172
Total assets acquired			0
Liabilities:
Deposits			0
Other liabilities			0
Total liabilities assumed			0
First Green Bancorp, Inc. | Initially Measured October 19, 2018
Assets:
Cash			29,434
Investment securities			32,145
Loans, net			631,497
Fixed assets			16,828
Other real estate owned			410
Core deposit intangibles			10,170
Goodwill			56,198
Other assets			40,669
Total assets acquired			817,351
Liabilities:
Deposits			624,289
Other liabilities			79,018
Total liabilities assumed			703,307
First Green Bancorp, Inc. | As Adjusted October 19, 2018
Assets:
Cash			29,434
Investment securities			32,145
Loans, net			631,497
Fixed assets			16,828
Other real estate owned			410
Core deposit intangibles			9,492
Goodwill			56,704
Other assets			40,841
Total assets acquired			817,351
Liabilities:
Deposits			624,289
Other liabilities			79,018
Total liabilities assumed			$ 703,307